Keystones — Lintel
Five GCSE retrieval questions · 22 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 4,000,000 in standard form
Answer: 4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.19cm -
4. Ratio Mixed ratio problems
Divide 100 in the ratio 2:1:2
Answer: 40, 20 and 40 -
5. Statistics Mean
Calculate the mean of: 45, 19, 18, 50, 38, 39, 25. Give your answer to 2 decimal places
Answer: 33.43